fastopen_connect
fastopen_connect:1, /* FASTOPEN_CONNECT sockopt */
tp->fastopen_connect = val;
val = tp->fastopen_connect;
if (tp->fastopen_connect && !tp->fastopen_req) {
int fastopen_connect(int server_fd, const char *data, unsigned int data_len,
sk_fds->active_fd = fastopen_connect(sk_fds->srv_fd, fast,